<template>
  <!-- 筛选区 -->
  <div class="sub-filter" v-if="filterData && !filterLoading">
    <div class="item">
      <div class="head">品牌：</div>
      <div class="body">
        <a @click="cahngeBrands(item.id)" href="javascript:;" :class="{active:item.id === filterData.brands.selectedBrands}" v-for="item in filterData.brands" :key="item.id">{{item.name}}</a>
      </div>
    </div>
    <div class="item" v-for="item in filterData.saleProperties" :key="item.id">
      <div class="head">{{item.name}}：</div>
      <div class="body">
        <a @click="changeProp(item,prop.id)" href="javascript:;" :class="{active:prop.id === item.selectedProp}" v-for="prop in item.properties" :key="prop.id">{{prop.name}}</a>
      </div>
    </div>
  </div>
  <div v-else class="sub-filter">
    <XtxSkeleton class="item" width="800px" height="40px" />
    <XtxSkeleton class="item" width="800px" height="40px" />
    <XtxSkeleton class="item" width="600px" height="40px" />
    <XtxSkeleton class="item" width="600px" height="40px" />
    <XtxSkeleton class="item" width="600px" height="40px" />
  </div>
</template>
<script>
import { ref, watch } from 'vue'
import { useRoute } from 'vue-router'
import { findSubCategoryFilter } from '@/api/category'
export default {
  name: 'SubFilter',
  setup(props, { emit }) {
    const route = useRoute()
    // 监听二级类目变化获取筛选数据
    const filterData = ref({})
    const filterLoading = ref(false)
    watch(
      () => route.params.id,
      newVal => {
        // 变化后的id有值  且处在二级类目名路由下
        if (newVal && `/category/sub/${newVal}` === route.path) {
          filterLoading.value = true
          // 发请求
          findSubCategoryFilter(route.params.id).then(data => {
            // 每一组可选的筛选条件缺失 “全部” 条件  处理下数据加上全部
            // 给每一组数据加上一个选中的ID
            // 1 品牌
            data.result.brands.selectedBrands = null
            data.result.brands.unshift({ id: null, name: '全部' })
            // 2 属性
            data.result.saleProperties.forEach(item => {
              item.selectedProp = null
              item.properties.unshift({ id: null, name: '全部' })
            })
            // console.log(data)
            // 设置数据
            filterData.value = data.result
            filterLoading.value = false
          })
        }
      },
      { immediate: true }
    )
    // 获取筛选参数的函数
    function getFilterParams() {
      const obj = { brandId: '', attrs: [] }
      // 品牌
      obj.brandId = filterData.value.brands.selectedBrands
      // 销售属性
      filterData.value.saleProperties.forEach(item => {
        if (item.selectedProp) {
          const prop = item.properties.find(prop => prop.id === item.selectedProp)
          obj.attrs.push({ groupName: item.name, propertyName: prop.name })
        }
      })

      // 要返回的数据格式{brandId: '', attrs: [{groupName:'', propertyName:''},...]}
      if (obj.attrs.length === 0) obj.attrs = null
      return obj
    }
    function cahngeBrands(brandId) {
      if (filterData.value.brands.selectedBrands === brandId) return
      filterData.value.brands.selectedBrands = brandId
      emit('filter-change', getFilterParams())
    }
    function changeProp(item, propID) {
      if (item.selectedProp === propID) return
      item.selectedProp = propID
      emit('filter-change', getFilterParams())
    }
    return { filterData, filterLoading, cahngeBrands, changeProp }
  }
}
</script>
<style scoped lang='less'>
// 筛选区
.sub-filter {
  background: #fff;
  padding: 25px;
  .item {
    display: flex;
    line-height: 40px;
    .head {
      width: 80px;
      color: #999;
    }
    .body {
      flex: 1;
      a {
        margin-right: 36px;
        transition: all 0.3s;
        display: inline-block;
        &.active,
        &:hover {
          color: @xtxColor;
        }
      }
    }
  }
  .xtx-skeleton {
    padding: 10px 0;
  }
}
</style>
